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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ef0865223c08dc618c7a94a841597146f71efd2808a72acf2aeab7b5d88054' 
  AND token = '7fK1KV4lju7onv5anJKTdT74/LTrM7Ox+B8hvCxq750=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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