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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd440e8dd2a530a1cee744c7a35b522899b209f08c3c90e2cdf0bad61c87af21a' 
  AND token = 'Fq4s3xOqPVMQqBtMa+zGPIj1k6lulaaMJ4hPz93erLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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