Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd507553e5f52c576dce2a71d4bfbd5728dc889eefe37242174fb5825a2e3239' 
  AND token = 'vcHaS3BLqDZyx+xQ8/8tNg4WOb1FMnOrulNi8/rk+MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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