SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc564930b2699ebde02e9a071f19f70142c3ae8522f68a8c667db769551e2c22' 
  AND token = 'qv1UYU+vGujoQWOXRrb2neIRrG16by7YCRb3BEmrLlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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