Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dfb72ff01e71b9cdb549ac7d6d15a3f2a421fd86433671cf72006f2fd174b4' 
  AND token = 'yKcD7BwtqDcmcPIx75HVk0a6eKn9rXx9vSUV7HUHxPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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