Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a012adf12c3365371a0f5f62ad2280156b7245941d8914b6b7b8e6aa85b93833' 
  AND token = 'y3wxvBslYP4NvtyFMS5DMKEmjpFHSB4alDO0CMocIlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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