Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb9905889201161f02d21e54b1cde2b23a1c3b14b8bc208a12beb06bf2de71d' 
  AND token = 'TeAckKEHvouLjwiFqFt9pG0KEitM6x8ZYDqJMFijl0k=' 
  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"
    }
  }
}