Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50907f3c07374eca89e1f74e257b3c5ecce2830ff6fab8e449436516881ba0a' 
  AND token = '7GYiHf1l3RN+8WBu6JPP5Pbs0KvFcBHAAIDzgNtTAqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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