Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a47c29f1066282754d14fd58b400502dc84cb96d2b7b87e29a267e814cbbbba' 
  AND token = 'S5svaovsTslfhwuskE5AvyeK9vr3ed9EpgNUzdlDg0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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