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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6228bef7398c33732137242e4750c4042855521586fe24b5dd9c39d212d130c5' 
  AND token = 'kRcwvKPb6mxuiX45ExlLjLODb9/3HbQCZP1vLxoJfz4=' 
  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"
    }
  }
}