Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f29928434d16f8a8d6c560bb24ebc96053d10e89074413ff1be1cbddebfd92c' 
  AND token = 'g4IHuULrhzncoGGEQVojdtQVwT8BVhyE+Rh6P7TO2iE=' 
  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"
    }
  }
}