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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33f8485796b5d003844fd5789a079a71e14ae9d6f57fa01e2fb8741aa01415c' 
  AND token = '+Uzajl9RAPwTk37VwnDa/tdCLgwPHAMyf8lK1Xrcnn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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