SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade91a8f5936216594d89cf5ab27e40275820f8b1ebe478d89fb43378fb0667' 
  AND token = 'z6x52AtV77A6mYC8ns7ye3K+AXYgYXpsA5CvhG/uzjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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