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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cb397fdd53ca06a525fa91eafeef24d01172c6449c1030a7da1b7052da9b82' 
  AND token = 'LO7U/DXEte2AdcQ43tVKXgL6Zur/8YgTxuiuuhPibyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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