Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883d18de3e91d55e8469e42ecbe5305dbf8e0a26508b86e53166dc637962698f' 
  AND token = 'MNb5yv/m9+ZeRb8TJnXxUqeueZULNbOtHmQCc+b8ilw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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