Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0996c04c26278d0205248751078a05df526a17c8a22f6ea8b28b9ac2f2b38dc' 
  AND token = 'hlmAHq8IGgVFpXNnCqbmBKR47OGBwejAS2DKtFOadUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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