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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b60d92ea692e24008560502ea9d24d63218c7de970d47908d5058895f4a9a8' 
  AND token = 'pjNf3L7/AmPq4luAo3eSn7xiYBX1V8psMEr5B8K+eSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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