Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39b50791230cf87dbf8d5232d78a90ac0bac7a23ca7330dd5c44879b6c2c665' 
  AND token = 'i0ePLiASBXDHbClwd9dBIfcvhD0yeZ/rEvluDPu0l2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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