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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e50d60bc88a67fd873886e638271d1dc0c8d48516c5dd750bb01d7ce6cc68a' 
  AND token = '7gA1hG13KeVtxp1ilt9ucSsCqqyMluI9k6uNhCnNyIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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