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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c86ef4e1cb5e68f9dc21604d9784b00e7ed19a591562a99ad557f164cf5162' 
  AND token = 'i/g4qbdQe1w4WRPhZbUy3NOnsm5xQLqhr/+7ImaGBo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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