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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e0e4132359178f5b89e6fe750f94436f46a957957e5733eaa6e7509b235e10' 
  AND token = '28j0VjJvXVhKt1HOCXE+e5GGWl0XSxQb9sx5dYwPziU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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