Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c318ca8e039decf4fd589d2a25d99f0896c432b96e600c799446de121c180' 
  AND token = 'nUZlpdn8s75GRua9VwTNZIB3Siio9sW7OonsdOgsPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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