Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a77fe88c08af3816e57a07caf268ceae2830fcee0ec7ee7e98e09c2841ea09' 
  AND token = 'j8nlnsKNGalKQEyjHqebqbpccuFiI3uhLTm1P81apo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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