SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d014e146edaed0c421058c492917e76991a3632b6738de373ce410ff919805b' 
  AND token = 'zU2SbC+mz2YXFXZ5U/0Q4tDK0zgGWVeH+kqpMYXoESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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