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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a0748f29f8145e3b3566b6fbf0d76af373e253fb0ac383b283157d1f8bcecd' 
  AND token = 'cLb9XwAgojLrvi7M2XZrM00nURj5NlPpgMUYp51Y4P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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