Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a200dc9bf090cf8de4a229ed9dc394a9875f709f3b8b1628302a6432e5fe095d' 
  AND token = 'EkrOKBr1NsFUE0JjhpO4dcZD5Gew/YmBb4nRjraaR1Y=' 
  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"
    }
  }
}