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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c579e2e6ec7c1e40c630c6457ee81d7484aab1f95306009a986a7ad3f23f3187' 
  AND token = 'U0jQiFmD9aPk73HSZJi0J77IEIHjJ25vEN27dLTkJ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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