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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef26b2fd11f09b8ab4cff5b0e910f2a1397a3d07b9837f539f2f1d5afef5e969' 
  AND token = 'm5OZxYwodU1RU5fzm24jONzvIRwxgQd+7t93SdxTLEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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