SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f750bd32e44c58a37e520555a29800e38c6a47c729b904faed09c25ed89b492' 
  AND token = 'AkqZixVhUOW+yjL6qPYG6/E+CTub70k1JP0YZ5htsfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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