Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1834adf0caca1168fb8f4b6c550051249ed377c2bafc888ac5c7bb939fffaa' 
  AND token = 't7C9aYHvXrtFva8MMZcrFg9RSY4djrgO8szeRHTpb+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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