Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8d72cafa7adbf785555a7b8edd3cf87d579bf2683d41313f8c38e4d9e6f744' 
  AND token = 'iWhWlyIM+XLg9kvpHzReYG/4aILgm3em6V6AlveewP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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