Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78223f75b9f8e8bf351edf64373d406f141072685c99b507d52f56f1155e680c' 
  AND token = 'tpuW94rgJPBcfw7hDt9Ffstx6OIsvhSGm355YqOEqx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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