Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbe22ca46125b25ebf892a492a0c0440043c22e5d54da2e6e3984d568371738' 
  AND token = 'Fi6YhxKEfOqSbRK9CyhvK5INoemumnTr465alKLXXhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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