Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0fb7c97a4f9f2c70ca2999c23a0514a3df5c472044fa719cd4d09340fe6056' 
  AND token = 'e1uBjM8yEmbqMQ+PbLylD0gwbHgmJSajQJyqftgxZuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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