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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3914de398ba11b616cde3e5367b2e91c3b7b0e53660acb7d8c44cf9ea97f37d' 
  AND token = 'qRQrEztxczNTMhQjJEs6tYkjA2YeM9ZqiUZ8+ExwQSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}