SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13a0e7f1eef3060d5697ec812dd8e9a46348b3b714175af074a356d1323042a' 
  AND token = 'wjXjMGPk7pIFNX4q2ovT8hDkB3ZSprwUYOKZAUhx3qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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