Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2c75890682d737e45c301dafe07d0c1b3a6fb966536ee62a7ee7e75e787032' 
  AND token = 'HJ4HLj3/31e1OHPNf+CqL7Dge1jY4rLo+R8o9bubMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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