Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70be3796835df6aada1c0b1212e3495bb4c8dbccb4b374cf89d12d9c84bcc7f5' 
  AND token = 'h1hKEaSQk7SUUIV1rfXIbHjocmL0P/pwBavz4niqZWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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