Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf50350f5dc72f7171a94ed322d7f6334bfbacff9ad12af08813c45b51c7127' 
  AND token = '1E66fGKNFXTaom9mT8OjIsKaYNgkyjpCbIuCA8fOQDY=' 
  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"
    }
  }
}