Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd59a7bbd5832ff5b7a29b00ac09f89f6be56ca1b98d7a92895dd048b5d77f0e' 
  AND token = 'Usir64KQlFTONUIG6nrr6b28uUKagpdHjvBOGETXMyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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