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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea681c70c45a1dc397f40a147e9b4004f0589cb1223840e9d93326c06f4a36a' 
  AND token = 'hqZVlZA2ZJb8LL0RQqzzcU9h223Z1RNhMi7XuiyaiYg=' 
  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"
    }
  }
}