Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a05d7000145912834c957245a6cf0f3dd673fb5e80bafbe58f27304e0d6523' 
  AND token = 'okXvTqJ7b/IRnU7o3ndQdMXjXJ1TUDMCvrWiSre7uI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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