SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1879018156a791854ec5449f225770d0a553d9a07c89257f7bafbb374b7521cd' 
  AND token = 'MW6TbWj5UHKxnRYcX5VhtmcLLJzChUbzrQJhuhfYsqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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