Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fc534562df8a77be5373c78ec9c16bb617eaab11334136b7c682dfac8aac57' 
  AND token = 'D5uvH6ZquQxT4kKfKbBfV45RPadu5cnF6EhbD8BWstc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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