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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6d6bd2e3340c42ace2f21c92d788f101378ac105c3c4c6e40c70adfb45ac2a' 
  AND token = 'dfGJKjBdRVOibiNWILDbQ3v0JJmhfNkEKXKM3A0a70I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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