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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b8276e61749ec70661af89732fd63f37161cbdf1937f62203950d4fe9fc4e0' 
  AND token = '6W91hvxMq16qe3P/oMVEfHfQ5nQzOyfmWHQBoF4qHXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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