Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c6d165cbf921c9a1c694eb281a7335b5019cbde1acd9c88f25decc83885fe0' 
  AND token = 'SXHkliv68x3HkzX2ndll6RHI7lGNdqB4wuzlQT0pesg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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