Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550b969a297da4099638cb38219f00bf21206c52ed10b01d6ea6098066f3eb69' 
  AND token = 'uL3EHWrVDMEDkmJiOsmCGczJFAFa8scawZLRL0LlewY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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