Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b074d2133a0ed669d29bfa6837b63cc6ad98855b932ac79f8caa9965aac297c7' 
  AND token = '67XQRxfZatnMtWsSazIFz7mHeLjQh8ufX4d7OKwroeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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