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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f39b79f4d33a308366195944d6bee5c27edd305553e71b6d74d2dc8bf3b892e' 
  AND token = '8WKl61d1QbyLsMecWlyd1ElmDkWKmpZBVD5ej+jr5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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