SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dde116679d9b6b94b629053988c2fc24c07ee9c4e8a14de1cb724c5029bf5f' 
  AND token = 'wK5tKw749YmtQLWJ1JBmVhg7zqwk77LQ61nEDHYA3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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