SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e883f8ebb2cb60427818a5030589234feb0596bf2ab7431f56155ab4d3767a26' 
  AND token = 'uvW4YeoPuWqA5fy/YYHvlJhzhrfrYxWq1FCj5NnZsEw=' 
  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"
    }
  }
}